<template>
    <div class="todo-footer" v-show="todos.length">
        <label>
            <input type="checkbox" :checked="isAll" @change="checkAll"/>
            <!-- <input type="checkbox" v-model="isAll"/> -->
        </label>
        <span>
            <span>已完成{{doneTotal}}</span> / 全部{{todos.length}}
        </span>
        <button class="btn btn-danger" @click="clearAll">清除已完成任务</button>
    </div>
</template>

<script>
export default {
    name:"MyFooter",
    props:["todos","checkAllTodo","clearAllTodo"],
    methods:{
        checkAll(e){
            this.checkAllTodo(e.target.checked);
        },
        clearAll(e){
            this.clearAllTodo();
        }
    },
    computed:{
        doneTotal(){
            let i = 0;
            this.todos.forEach((todo)=>{
                if(todo.done){
                    i += 1;
                }
            });
            return i;
        },
        isAll:{
            get(){
                return this.doneTotal === this.todos.length && this.todos.length > 0;
            },
            set(checked){
                this.checkAllTodo(checked);
            }
        }
    }
}
</script>

<style scoped>
    /*footer*/
    .todo-footer {
        height: 40px;
        line-height: 40px;
        padding-left: 6px;
        margin-top: 5px;
    }

    .todo-footer label {
        display: inline-block;
        margin-right: 20px;
        cursor: pointer;
    }

    .todo-footer label input {
        position: relative;
        top: -1px;
        vertical-align: middle;
        margin-right: 5px;
    }

    .todo-footer button {
        float: right;
        margin-top: 5px;
    }
</style>